I'd have to disagree with most of you on this 1, i have an 83 d150 shortbox with a factory 4 speed truck that had a blown /6 in it so i ripped it out, thru in my 318 bored .030 over with heavy TRW slugs in it with 360 J heads, along with the 284/284 / 484/484 cam in it, the reason it has no low end is probably because the cam was installed straight up, Knuckleduster degree that cam in at a 106 intake center line, add advance timing in it (i added 6 degrees in mine), get rid of the smog heads (my compression is right around 9.3 to 10) the little ***** will wake right up, Crackedback on this site gave me the suggestion!!!! night and day difference, thats a great cam but installed straight up will come in somewhere around 110 and its not a good location for this specific cam it'll be a dog turd at straight up on low end!!!!!